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More like suspended in the open top. I'd have to re-watch the graysgarage videos for more specific detail.
CFD is better than nothing. Compare the 8-bit video screen shots from the 1980s with newer games that have characters with embroidered silk sleeves fluttering in the wind. It's like that.
While generating absolute values is difficult, relative values (averaged over multiple runs) can be helpful. That's A-B testing.
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